Avaya S8700 - Page 182

Alarms, Errors, and Troubleshooting
555-233-143
4-108 Issue 1 May 2002
4. If the packet-bus fault is not present:
a. Reinsert circuit packs one at a time and repeat the following
substeps until every circuit pack has been reinserted.
b. Determine whether the packet-bus fault has returned.
c. If the packet-bus fault has returned, the reinserted circuit pack is
defective. Replace the circuit pack and then continue.
d. If the packet-bus fault does not return when every circuit pack has
been reinserted, you are finished.
Continue with Procedure 3: Removing and Reinserting EPN’s Control Circuit
Packs if every port circuit pack has been checked, but the packet-bus fault is still
not resolved.
Procedure 3: Removing and Reinserting EPN’s
Control Circuit Packs
Procedure 3 removes and reinserts an EPN’s control circuit packs one at a time.
The following control circuit packs either use the packet bus for communication or
are connected to it in the backplane wiring:
■ TN2312 IP Server Interface (IPSI)
■ TN768, TN780, or TN2182 Tone-Clock
■ EPN’s TN775 Maintenance
These are the only EPN control circuit packs that are likely to cause a packet-bus
problem in a stable system. Perform this procedure on only these circuit packs.
If the TN771D stand-alone mode does not indicate packet-bus faults. Perform
Procedure 3 for only the IPSI or Tone-Clock circuit pack. Do not check for
problems with backplane pins; determining whether the problem is resolved by
removing circuit packs is sufficient.
For a high- or critical-reliability system:
1. To remove an EPN’s IPSI circuit pack, use set ipserver-interface Uc if
necessary to make the suspected circuit pack the standby. (Before
executing an interchange, always check the status of the standby IPSI’s
Tone-Clock circuit with status port-network.)
To remove an EPN’s Tone-Clock circuit pack, use set tone-clock if
necessary to make the suspected circuit pack the standby. (Before
executing an interchange, always check the status of the standby
Tone-Clock with status port-network.)
2. Determine whether the backplane pins in the removed circuit pack’s slot
are bent.